feat: secure biometric implementation

[lubbo]

Problem

Get and Set credentials were not enforcing biometric encryption.

Solution

• JS interface was not modified.
• Native implementation now uses biometric native API to get and set credentials as per iOS and Android specifications:

Android

https://medium.com/androiddevelopers/using-biometricprompt-with-cryptoobject-how-and-why-aace500ccdb7

iOS

https://developer.apple.com/documentation/localauthentication/accessing_keychain_items_with_face_id_or_touch_id

• Credentials are wiped out if device biometry is changed (add or remove biometry factors)
• Passcode has to be set on the device

Additional changes

• Android support for multiple credentials has been implemented (based on server parameter)
• Both Android and iOS code has been refactored to be more aligned with MVVM and MVC patterns:

Android

• ViewModel for AuthActivity has been created and all non UI logic has been moved there.
• Credentials class model has been created with from/to JSON utilities.
• Crypto logics have been moved into a dedicated CryptoManager.
• Due to potentially insecure plugin response implicit Intent, getCredentials response is passed from Activity to NativeBiometric Plugin using a LocalBroadcastManager.
• All string parameters keys have been moved into dedicated constants.
• Gradle and AGP have been updated to 7.5 and 7.4.1
• Android target and compile sdk versions have been updated to 32.

iOS

• All crypto logic has been extracted from plugin class and moved into a dedicated CryptoManager class

[kiwi-josh]

Bump on this 🙏